CONTENTS 



Page 



Establishment of the sea lamprey in Cayuga Lake 561 



Size, growth, and morphometry of the sea lamprey 562 



Length composition 562 



Weight composition 563 



Growth of parasitic-phase sea lampreys 565 



Comparison with size in other landlocked populations 567 



Length-weight relation of adults — 567 



Morphometry — 569 



Seasonal changes and sexual differences in body proportions 569 



Morphometric comparison of Cayuga Lake and Seneca Lake sea lampreys 572 



Spawning migration 576 



Tributaries of Cayuga Lake 576 



Water conditions in Cayuga Inlet 576 



Migratory behavior 576 



Population estimates of spawning adults 578 



1950 578 



1951 579 



1952 581 



Rate of upstream movement 581 



Barriers to upstream migration — 582 



Sex ratio 584 



Size of upstream migrants 586 



Body color 586 



Spawning habits 587 



Nest building 587 



Time of construction and location of nests 588 



Spawning 589 



Fecundity 590 



Postspawning habits and morphological changes 592 



Loss of body weight and length 593 



Egg development and habits of ammocoetes 593 



Egg development 593 



Habits of ammocoetes 594 



Food and feeding 595 



Duration of larval life 595 



Transformation and downstream movement 602 



Parasitic habits 602 



Sea lamprey parasitism on like trout in Cayuga and Seneca Lakes 603 



Loss of body weight resulting from sea lamprey attacks 604 



Length of trout and incidence of sea lamprey attacks 607 



Annual variations in incidence of sea lamprey attacks 608 



Incidence of sea lamprey parasitism in various parts of Cayuga Lake 609 



Seasonal trends in feeding activity of sea lampreys 611 



Comparison of sea lamprey parasitism in Seneca and Cayuga Lakes 611 



Location of attachment on the fish's body 612 



Sea lamprey parasitism on the white sucker 612 



Parasites and predators of the lamprey 612 



Parasites 613 



Predators 613 



Control methods 613 



Summary 614 



Literature cited 616 



